[GRLUG] "network is unreachable"

[donlumber at comcast.net]

----- Original Message ----- 
From: "Bob Kline" <bob.kline at gmail.com> 
To: grlug at grlug.org 
Sent: Wednesday, February 10, 2010 10:03:18 PM GMT -05:00 US/Canada Eastern 
Subject: [GRLUG] "network is unreachable" 

I somehow managed to hose the 
Ethernet connect on a laptop running 
Ubuntu 9.10. The bottom line is that 
when I try to ping an outside URL I get 
"network is unreachable." I've done 
some searching on the Internet for 
this, but so far nothing clicks. 


Some relevant things: 


* ifconfig shows that eth0, lo, and wan0 
are gone, so I set them all to "up." 


* /etc/resolv.conf looks OK. 


* I can ping 127.0.0.1, but nothing outside. 


* "/sbin/dhclient wlan0" was not running, 
so I started it. 


* I've done other A-B comparisons with 
a machine also running Ubuntu 9.10, 
and has a working eth0 port, but so far 
nothing has shown me the key thing 
that is missing. 


One suggestion on the Internet was to 
use dhcpcd, but I don't have it installed, 
and can't do it now. The machine does 
not have a CDROM unit, and of course I 
don't have Internet access..... 


Does this much suggest anything to try 
to anyone? I've power cycled, but some 
software might be missing, and when 
I come back up I have to run ifconfig again 
to set things up. 


-- Bob 


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Have you tried removing /etc/udev/rules.d/70-persistent-net.rules ? 
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